<span
  *ngFor="let item of list; let i = index; let last = last"
  class="lv-tree-indent-item"
  [class.lv-tree-indent-none-line]="lvIsEnd[i + 1] && !last"
  [class.lv-tree-indent-half-line]="lvIsEnd[i + 1] && last"
  [class.lv-tree-indent-horizontal-line]="last"
>
</span>
